The phrase "putting John Hancock on" refers to the act of signing one's name on a document. However, there are several antonyms for this phrase, which describe the opposite action of signing or not agreeing to sign a document. These antonyms include refusing, rejecting, declining, abstaining, or dissenting. Refusing to put a John Hancock on a document is often an act of protest, disagreement, or a lack of trust in the document's content. On the other hand, abstaining from signing may indicate an unwillingness to commit or a lack of interest in the content. Whatever the case may be, antonyms for putting John Hancock on highlight the importance of choice, consent, and informed decision-making in legal matters.